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STOCKHOLDERS'EQUITY: (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended 50 Months Ended
Sep. 30, 2012
Aug. 31, 2012
Jun. 30, 2012
May 31, 2012
Apr. 30, 2012
Jul. 31, 2011
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2008
Oct. 14, 2010
Dec. 31, 2011
Sep. 30, 2009
Dec. 31, 2008
Sep. 30, 2012
SCC share repurchase program:                            
Amount authorized for share repurchase program           $ 1,000             $ 500  
Total Number of Shares Purchased 2,763,850 100,000 370,000 500,000 278,486   2,863,850 1,148,486 28,510,150 15,600 9,034,400 4,912,000   46,484,486
Average Price Paid per Share $ 34.71 $ 32.47 $ 28.33 $ 28.57 $ 30.23   $ 34.63 $ 28.89 $ 13.49 $ 29.69 $ 30.29 $ 14.64   $ 18.57
Total Number of Shares Purchased as Part of Publicly Announced Plan 46,484,486 43,720,636 43,620,636 43,250,636 42,750,636   46,484,486 43,620,636 28,510,150 33,437,750 42,472,150 33,422,150 28,510,150 46,484,486
Maximum Number of Shares that may yet be Purchased Under the Plan @ $31.51 3,984,848           3,984,848             3,984,848
Share purchase price under the plan (in dollars per share) $ 34.36           $ 34.36             $ 34.36
Total Cost $ 95.9 $ 3.2 $ 10.5 $ 14.3 $ 8.4   $ 99.1 $ 33.2 $ 384.7 $ 0.5 $ 273.7 $ 71.9   $ 863.1
Percentage of ownership interest held by the parent company 81.20%           81.20%             81.20%